Magnesium perborate.



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OTTO L I EBKNEUHT, OF FRANKFORT-ON-THE-MAIN. GERMANY, ASSIGNOR TO THEROESSLER & HASSLACHER CHEMICAL COMPANY, OF NEW YORK, N. Y., ACORPORATION OF NEW YORK.

- MAGNESlUM PIERIBOHATE.

. To all whom it may concern:

' the production of ma nesium perborate as a new roduct of manu acture.

I s all describe the process I prefer for producing magnesium perborate,first stating the same generally and then giving a specific example.

An alkali peroxid, such as sodium peroxid is added to water, thesolution being cooled during the addition to prevent any considerablerise in temperature. Then the magnesium salt-for instance, magnesiumsulfate or magnesium chlorid dissolved in water-is permitted to flow inwhile the solution is being well stirred and further cooled. Finally,veg finely-pulverized boracic acid is added.

he mixture is then stirred for a short time,

and the magnesium perborate is separated by filtration from the liquid.The perborate is then dried by subjectlng the same to a fairlylow degreeof temperature. The remaining liquid may be used in the subsequentpractics of the process by adding to one part of the same sodium peroxidand dissolving in the other art the magnesium salt to be used.

The following exam le will more fully illustrate the rocess: ighthundred and thirty grams 0 sodiumperoxid (ninety-four per cent.) areadded to four liters of water,

the mixture being stirred and cooled during the addition. Continuing thestirring, a solution of two kilograms ofmagnesium chlorid, (MgCl, -l-6Hfinally eight hundred and fifty grams of beracicaci B(OH),, inafinely-pulverized state, is added. Seventy cubic centimetersSpecification of Letters Patent.

Application filed February 17, 1905. Serial No. 246,069.

for instance, in about four liters of water, 1s slowly poured 1n, and

Patented April 3, 1906.

of muriatic acid (1.12 specific gravity) is preferably added to themagnesium-chlorid solution, corresponding to the excess of alkali.The'compound should be stirred for about half an hour, the preci itateof magnesium perborate being then "Ii tered off, the filtrate being usedin the further operation of the process, as set forth.

Magnesium perborate is a white amorphous precipitate and resembles inits most important roperties magnesium borate. 'Treating t e same forsome length of time with water, acid magnesium perborate goes intosolution, leaving basic magnesium perborate,

so that in treating with water only a more or less basic product isobtained- 5. a, a prodnot with a varying amount of boracic acid andactive oxy en. A good washed product free from chlorid had the followingcontents: 32.7 per cent., MgO; 21.7 per cent., B 0 8.9 per cent., active0, 36.3 per cent.,water,

That the product obtained is magnesium perborate and not simply amixture of mag-.

nesmm peroxid and boracic acid is shown by the fact that aside from thevisible and chemical properties of the new body the yield of activeoxygen is almost theoretical, Whlle the yield of ex gen-from magnesiumperoxid is very much ess. Magnesiumperborate is of great durability andwill find use for medici nal and bleach'm purposes.

Having descri ed my invention, what a I claim, and desire to secure byLetters Patent of the United States, lS-;-

As anew product of manufacture magnesium perborate, a White, amo housprecipitate in treating which for some ength of time with water acidmagnesium perborate goes into solution, leaving basic magnesiumperborate. r

In testimony whereof I have hereunto signed my name in the presence oftwo'subscribing Witnesses.

OTTO LIEBKNECHT'. Witnesses Hons'r ZIEGLER, CARL GRUND.

